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A Kjeldahl System is a laboratory apparatus used for the determination of nitrogen content in organic compounds, particularly protein analysis in food and feed samples. It employs a series of chemical digestion, distillation, and titration steps to convert nitrogen-containing compounds into ammonia, which is then quantified using acid-base titration. Kjeldahl systems offer accurate nitrogen determination, compatibility with various sample types, and compliance with standardized methods such as AOAC and ISO. Key specifications include:

• Digestion method: Manual or automated digestion units for the decomposition of organic matter and liberation of nitrogen as ammonia
• Distillation method: Steam distillation or microdistillation techniques for the separation and collection of ammonia from the digestion mixture
• Titration method: Acid-base titration using standardized acids and bases to quantify the amount of ammonia produced during digestion
• Sample throughput: Single or multiple sample digestion and distillation units for high throughput nitrogen analysis
• Safety features: Fume hoods, reflux condensers, and safety interlocks to prevent exposure to hazardous chemicals and fumes during operation